Abstract: According to one embodiment, a hair accessory includes a base and a curved hollow tube coupled to the base. The base is configured to be positioned against a head of a person. The curved hollow tube is configured to provide structural support to a portion of hair of the person gathered around the curved hollow tube. The curved hollow tube has a first end that is coupled directly to the base and a second end distally located from the base. The curved hollow tube includes a plurality of ridges positioned along a length of the curved hollow tube. Each of the plurality of ridges extends along a perimeter of the curved hollow tube.

Abstract: According to one embodiment, a hair accessory includes a base and a curved hollow tube coupled to the base. The base is configured to be positioned against a head of a person. The curved hollow tube is configured to provide structural support to a portion of hair of the person gathered around the curved hollow tube. The curved hollow tube has a first end that is coupled directly to the base and a second end distally located from the base. The curved hollow tube includes a plurality of ridges positioned along a length of the curved hollow tube. Each of the plurality of ridges extends along a perimeter of the curved hollow tube.

Abstract: Process for the preparation of monofunctionalized cyclic tertramines of formula I ##STR1## in which R denotes a saturated or unsaturated, especially polymerizable, organic radical, characterized in that the corresponding tetraazacycloalkane compound (according to formula II) is prepared, in which three of the four nitrogen atoms are bonded via covalent bonds with a single atom or group of intracyclic atoms A, in that this triprotected compound is reacted with an organic compound RX (of formula III), X denoting a nucleophobic group, and in that the tetraazacycloalkane compound which is tri-protected and monofunctionalized on the unprotected nitrogen (according to formula IV) thus obtained is deprotected.